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NEW FERRITIC STAINLESS STEELS FOR AUTOMOTIVE TRIM APPLICATION

New ferritic stainless steels have been developed for use by the automobile industry. These steels demonstrate high resistance to pitting and a longer product lifetime can be expected, especially in "chloride type" environments. This report deals with the effects of alloying elements on steels containing 16-19% Cr, with special attention devoted to pitting resistance. It was observed that a small amount of Cu and Ni increased pitting resistance. A decrease in the S content of the steel led to an increase in the pitting resistance. The remarkable improvement in the rust staining resistance for this low S steel was confirmed by the CASS test. Based on results, 19%Cr-0.5%Cu-Ni-(Nb)-low S ferritic stainless steels were selected. These steels "NSS442M2" and "NSS442M3" have excellent rust staining resistance in the accelerated tests. The atmospheric exposure test proved that the rust staining resistance of NSS442M2 and NSS442M3 was comparable to or greater than that of Type 304. Type 430 stainless steel had been used as an automotive trim material. However, in order to meet the demand for higher corrosion resistance, Mo bearing Type 434 stainless steel is currently being used. Mo is costly as an alloying element. Due to problems in obtaining a stable primary supply, pricing structures of Type 434 have been difficult to establish. In order to overcome these situations, new ferritic stainless steels, which have a higher rust staining corrosion resistance than Type 434 were developed. These steels contain Ni and Cu instead of Mo. The Cr content is higher than that of Type 434. The S content is maintained at a very low level. This report deals with basic corrosion research for experimental heats and characteristics of the newly developed NSS442M2 and NSS442M3. NSS442M2 is equal to or better than Type 434, and NSS442M3 is equal to or better than that of Type 304.

  • Supplemental Notes:
    • The Study and Prevention of Corrosion SP-538. International Congress and Exposition, Detroit, Michigan, February 28-March 4, 1983.
  • Corporate Authors:

    Society of Automotive Engineers (SAE)

    400 Commonwealth Drive
    Warrendale, PA  United States  15096
  • Authors:
    • Adachi, T
    • Kanamaru, T
  • Publication Date: 1983-2

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00376625
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Report/Paper Numbers: SAE 830586, HS-034 523
  • Files: HSL, USDOT
  • Created Date: Jul 30 1983 12:00AM